Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Pentium III FXSR, SSE support |
| 6 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
| 7 | */ |
| 8 | |
| 9 | /* |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 10 | * Handle hardware traps and faults. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/kallsyms.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 14 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/kprobes.h> |
Andrew Morton | 1e2af92 | 2006-09-27 01:51:15 -0700 | [diff] [blame] | 16 | #include <linux/uaccess.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 17 | #include <linux/utsname.h> |
| 18 | #include <linux/kdebug.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/ptrace.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/unwind.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/kexec.h> |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/timer.h> |
| 29 | #include <linux/init.h> |
Jeremy Fitzhardinge | 91768d6 | 2006-12-08 02:36:21 -0800 | [diff] [blame] | 30 | #include <linux/bug.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 31 | #include <linux/nmi.h> |
| 32 | #include <linux/mm.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 33 | #include <linux/smp.h> |
| 34 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #ifdef CONFIG_EISA |
| 37 | #include <linux/ioport.h> |
| 38 | #include <linux/eisa.h> |
| 39 | #endif |
| 40 | |
| 41 | #ifdef CONFIG_MCA |
| 42 | #include <linux/mca.h> |
| 43 | #endif |
| 44 | |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 45 | #if defined(CONFIG_EDAC) |
| 46 | #include <linux/edac.h> |
| 47 | #endif |
| 48 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 49 | #include <asm/stacktrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/debugreg.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 52 | #include <asm/atomic.h> |
| 53 | #include <asm/system.h> |
| 54 | #include <asm/unwind.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 55 | #include <asm/traps.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <asm/desc.h> |
| 57 | #include <asm/i387.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 58 | |
| 59 | #include <mach_traps.h> |
| 60 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 61 | #ifdef CONFIG_X86_64 |
| 62 | #include <asm/pgalloc.h> |
| 63 | #include <asm/proto.h> |
| 64 | #include <asm/pda.h> |
| 65 | #else |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 66 | #include <asm/processor-flags.h> |
| 67 | #include <asm/arch_hooks.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #include <asm/nmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <asm/smp.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 70 | #include <asm/io.h> |
Jaswinder Singh | 6ac8d51 | 2008-07-15 21:09:13 +0530 | [diff] [blame] | 71 | #include <asm/traps.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Alexander van Heukelum | eb642f6 | 2008-09-09 21:56:11 +0200 | [diff] [blame] | 73 | #include "cpu/mcheck/mce.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 75 | DECLARE_BITMAP(used_vectors, NR_VECTORS); |
| 76 | EXPORT_SYMBOL_GPL(used_vectors); |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | asmlinkage int system_call(void); |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | /* Do we ignore FPU interrupts ? */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 81 | char ignore_fpu_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | /* |
| 84 | * The IDT has to be page-aligned to simplify the Pentium |
| 85 | * F0 0F bug workaround.. We have a special link segment |
| 86 | * for this. |
| 87 | */ |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 88 | gate_desc idt_table[256] |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 89 | __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, }; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 90 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Alexander van Heukelum | badc765 | 2008-07-02 01:30:30 +0200 | [diff] [blame] | 92 | static int ignore_nmis; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 93 | |
Alexander van Heukelum | 762db43 | 2008-09-09 21:55:55 +0200 | [diff] [blame] | 94 | static inline void conditional_sti(struct pt_regs *regs) |
| 95 | { |
| 96 | if (regs->flags & X86_EFLAGS_IF) |
| 97 | local_irq_enable(); |
| 98 | } |
| 99 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 100 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
| 101 | { |
| 102 | inc_preempt_count(); |
| 103 | if (regs->flags & X86_EFLAGS_IF) |
| 104 | local_irq_enable(); |
| 105 | } |
| 106 | |
| 107 | static inline void preempt_conditional_cli(struct pt_regs *regs) |
| 108 | { |
| 109 | if (regs->flags & X86_EFLAGS_IF) |
| 110 | local_irq_disable(); |
| 111 | dec_preempt_count(); |
| 112 | } |
| 113 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 114 | #ifdef CONFIG_X86_32 |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 115 | static inline void |
| 116 | die_if_kernel(const char *str, struct pt_regs *regs, long err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
Vincent Hanquez | 717b594 | 2005-06-23 00:08:45 -0700 | [diff] [blame] | 118 | if (!user_mode_vm(regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | die(str, regs, err); |
| 120 | } |
| 121 | |
Alexander van Heukelum | ae82157 | 2008-09-30 18:41:35 +0200 | [diff] [blame] | 122 | /* |
| 123 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an |
| 124 | * invalid offset set (the LAZY one) and the faulting thread has |
| 125 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS, |
| 126 | * we set the offset field correctly and return 1. |
| 127 | */ |
| 128 | static int lazy_iobitmap_copy(void) |
| 129 | { |
| 130 | struct thread_struct *thread; |
| 131 | struct tss_struct *tss; |
| 132 | int cpu; |
| 133 | |
| 134 | cpu = get_cpu(); |
| 135 | tss = &per_cpu(init_tss, cpu); |
| 136 | thread = ¤t->thread; |
| 137 | |
| 138 | if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && |
| 139 | thread->io_bitmap_ptr) { |
| 140 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, |
| 141 | thread->io_bitmap_max); |
| 142 | /* |
| 143 | * If the previously set map was extending to higher ports |
| 144 | * than the current one, pad extra space with 0xff (no access). |
| 145 | */ |
| 146 | if (thread->io_bitmap_max < tss->io_bitmap_max) { |
| 147 | memset((char *) tss->io_bitmap + |
| 148 | thread->io_bitmap_max, 0xff, |
| 149 | tss->io_bitmap_max - thread->io_bitmap_max); |
| 150 | } |
| 151 | tss->io_bitmap_max = thread->io_bitmap_max; |
| 152 | tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET; |
| 153 | tss->io_bitmap_owner = thread; |
| 154 | put_cpu(); |
| 155 | |
| 156 | return 1; |
| 157 | } |
| 158 | put_cpu(); |
| 159 | |
| 160 | return 0; |
| 161 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 162 | #endif |
Alexander van Heukelum | ae82157 | 2008-09-30 18:41:35 +0200 | [diff] [blame] | 163 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 164 | static void __kprobes |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 165 | do_trap(int trapnr, int signr, char *str, struct pt_regs *regs, |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 166 | long error_code, siginfo_t *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 168 | struct task_struct *tsk = current; |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 169 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 170 | #ifdef CONFIG_X86_32 |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 171 | if (regs->flags & X86_VM_MASK) { |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 172 | /* |
| 173 | * traps 0, 1, 3, 4, and 5 should be forwarded to vm86. |
| 174 | * On nmi (interrupt 2), do_trap should not be called. |
| 175 | */ |
| 176 | if (trapnr < 6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | goto vm86_trap; |
| 178 | goto trap_signal; |
| 179 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 180 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Vincent Hanquez | 717b594 | 2005-06-23 00:08:45 -0700 | [diff] [blame] | 182 | if (!user_mode(regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | goto kernel_trap; |
| 184 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 185 | #ifdef CONFIG_X86_32 |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 186 | trap_signal: |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 187 | #endif |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 188 | /* |
| 189 | * We want error_code and trap_no set for userspace faults and |
| 190 | * kernelspace faults which result in die(), but not |
| 191 | * kernelspace faults which are fixed up. die() gives the |
| 192 | * process no chance to handle the signal and notice the |
| 193 | * kernel fault information, so that won't result in polluting |
| 194 | * the information about previously queued, but not yet |
| 195 | * delivered, faults. See also do_general_protection below. |
| 196 | */ |
| 197 | tsk->thread.error_code = error_code; |
| 198 | tsk->thread.trap_no = trapnr; |
| 199 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 200 | #ifdef CONFIG_X86_64 |
| 201 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
| 202 | printk_ratelimit()) { |
| 203 | printk(KERN_INFO |
| 204 | "%s[%d] trap %s ip:%lx sp:%lx error:%lx", |
| 205 | tsk->comm, tsk->pid, str, |
| 206 | regs->ip, regs->sp, error_code); |
| 207 | print_vma_addr(" in ", regs->ip); |
| 208 | printk("\n"); |
| 209 | } |
| 210 | #endif |
| 211 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 212 | if (info) |
| 213 | force_sig_info(signr, info, tsk); |
| 214 | else |
| 215 | force_sig(signr, tsk); |
| 216 | return; |
| 217 | |
| 218 | kernel_trap: |
| 219 | if (!fixup_exception(regs)) { |
Andi Kleen | d189518 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 220 | tsk->thread.error_code = error_code; |
| 221 | tsk->thread.trap_no = trapnr; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 222 | die(str, regs, error_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 224 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 226 | #ifdef CONFIG_X86_32 |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 227 | vm86_trap: |
| 228 | if (handle_vm86_trap((struct kernel_vm86_regs *) regs, |
| 229 | error_code, trapnr)) |
| 230 | goto trap_signal; |
| 231 | return; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 232 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | } |
| 234 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 235 | #define DO_ERROR(trapnr, signr, str, name) \ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 236 | dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 237 | { \ |
| 238 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 239 | == NOTIFY_STOP) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 240 | return; \ |
Alexander van Heukelum | 61aef7d | 2008-09-09 21:55:56 +0200 | [diff] [blame] | 241 | conditional_sti(regs); \ |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 242 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 245 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 246 | dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 247 | { \ |
| 248 | siginfo_t info; \ |
| 249 | info.si_signo = signr; \ |
| 250 | info.si_errno = 0; \ |
| 251 | info.si_code = sicode; \ |
| 252 | info.si_addr = (void __user *)siaddr; \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 253 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 254 | == NOTIFY_STOP) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 255 | return; \ |
Alexander van Heukelum | 61aef7d | 2008-09-09 21:55:56 +0200 | [diff] [blame] | 256 | conditional_sti(regs); \ |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 257 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 260 | DO_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
| 261 | DO_ERROR(4, SIGSEGV, "overflow", overflow) |
| 262 | DO_ERROR(5, SIGSEGV, "bounds", bounds) |
| 263 | DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip) |
Alexander van Heukelum | 51bc1ed | 2008-09-09 21:56:03 +0200 | [diff] [blame] | 264 | DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
Alexander van Heukelum | 6bf77bf | 2008-09-09 21:56:04 +0200 | [diff] [blame] | 265 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
Alexander van Heukelum | 36d936c | 2008-09-09 21:56:05 +0200 | [diff] [blame] | 266 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 267 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | f5ca818 | 2008-09-09 21:56:06 +0200 | [diff] [blame] | 268 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 269 | #endif |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 270 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 272 | #ifdef CONFIG_X86_64 |
| 273 | /* Runs on IST stack */ |
| 274 | dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code) |
| 275 | { |
| 276 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, |
| 277 | 12, SIGBUS) == NOTIFY_STOP) |
| 278 | return; |
| 279 | preempt_conditional_sti(regs); |
| 280 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); |
| 281 | preempt_conditional_cli(regs); |
| 282 | } |
| 283 | |
| 284 | dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code) |
| 285 | { |
| 286 | static const char str[] = "double fault"; |
| 287 | struct task_struct *tsk = current; |
| 288 | |
| 289 | /* Return not checked because double check cannot be ignored */ |
| 290 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); |
| 291 | |
| 292 | tsk->thread.error_code = error_code; |
| 293 | tsk->thread.trap_no = 8; |
| 294 | |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame^] | 295 | /* |
| 296 | * This is always a kernel trap and never fixable (and thus must |
| 297 | * never return). |
| 298 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 299 | for (;;) |
| 300 | die(str, regs, error_code); |
| 301 | } |
| 302 | #endif |
| 303 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 304 | dotraplinkage void __kprobes |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 305 | do_general_protection(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | { |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 307 | struct task_struct *tsk; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 308 | |
Alexander van Heukelum | c6df0d7 | 2008-09-09 21:56:07 +0200 | [diff] [blame] | 309 | conditional_sti(regs); |
| 310 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 311 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | ae82157 | 2008-09-30 18:41:35 +0200 | [diff] [blame] | 312 | if (lazy_iobitmap_copy()) { |
| 313 | /* restart the faulting instruction */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | return; |
| 315 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 317 | if (regs->flags & X86_VM_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | goto gp_in_vm86; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 319 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 321 | tsk = current; |
Vincent Hanquez | 717b594 | 2005-06-23 00:08:45 -0700 | [diff] [blame] | 322 | if (!user_mode(regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | goto gp_in_kernel; |
| 324 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 325 | tsk->thread.error_code = error_code; |
| 326 | tsk->thread.trap_no = 13; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 327 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 328 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
| 329 | printk_ratelimit()) { |
Masoud Asgharifard Sharbiani | abd4f75 | 2007-07-22 11:12:28 +0200 | [diff] [blame] | 330 | printk(KERN_INFO |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 331 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
| 332 | tsk->comm, task_pid_nr(tsk), |
| 333 | regs->ip, regs->sp, error_code); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 334 | print_vma_addr(" in ", regs->ip); |
| 335 | printk("\n"); |
| 336 | } |
Masoud Asgharifard Sharbiani | abd4f75 | 2007-07-22 11:12:28 +0200 | [diff] [blame] | 337 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 338 | force_sig(SIGSEGV, tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | return; |
| 340 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 341 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | gp_in_vm86: |
| 343 | local_irq_enable(); |
| 344 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); |
| 345 | return; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 346 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | gp_in_kernel: |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 349 | if (fixup_exception(regs)) |
| 350 | return; |
| 351 | |
| 352 | tsk->thread.error_code = error_code; |
| 353 | tsk->thread.trap_no = 13; |
| 354 | if (notify_die(DIE_GPF, "general protection fault", regs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | error_code, 13, SIGSEGV) == NOTIFY_STOP) |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 356 | return; |
| 357 | die("general protection fault", regs, error_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 360 | static notrace __kprobes void |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 361 | mem_parity_error(unsigned char reason, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 363 | printk(KERN_EMERG |
| 364 | "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n", |
| 365 | reason, smp_processor_id()); |
| 366 | |
| 367 | printk(KERN_EMERG |
| 368 | "You have some hardware problem, likely on the PCI bus.\n"); |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 369 | |
| 370 | #if defined(CONFIG_EDAC) |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 371 | if (edac_handler_set()) { |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 372 | edac_atomic_assert_error(); |
| 373 | return; |
| 374 | } |
| 375 | #endif |
| 376 | |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 377 | if (panic_on_unrecovered_nmi) |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 378 | panic("NMI: Not continuing"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 380 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | /* Clear and disable the memory parity error line. */ |
Alexander van Heukelum | 7970479 | 2008-10-03 22:00:36 +0200 | [diff] [blame] | 383 | reason = (reason & 0xf) | 4; |
| 384 | outb(reason, 0x61); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 387 | static notrace __kprobes void |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 388 | io_check_error(unsigned char reason, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
| 390 | unsigned long i; |
| 391 | |
Dave Jones | 9c10780 | 2006-01-09 20:51:32 -0800 | [diff] [blame] | 392 | printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | show_registers(regs); |
| 394 | |
| 395 | /* Re-enable the IOCK line, wait for a few seconds */ |
| 396 | reason = (reason & 0xf) | 8; |
| 397 | outb(reason, 0x61); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | i = 2000; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 400 | while (--i) |
| 401 | udelay(1000); |
| 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | reason &= ~8; |
| 404 | outb(reason, 0x61); |
| 405 | } |
| 406 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 407 | static notrace __kprobes void |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 408 | unknown_nmi_error(unsigned char reason, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | { |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 410 | if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == |
| 411 | NOTIFY_STOP) |
Jason Wessel | d359752 | 2008-02-15 14:55:53 -0600 | [diff] [blame] | 412 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | #ifdef CONFIG_MCA |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 414 | /* |
| 415 | * Might actually be able to figure out what the guilty party |
| 416 | * is: |
| 417 | */ |
| 418 | if (MCA_bus) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | mca_handle_nmi(); |
| 420 | return; |
| 421 | } |
| 422 | #endif |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 423 | printk(KERN_EMERG |
| 424 | "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n", |
| 425 | reason, smp_processor_id()); |
| 426 | |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 427 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 428 | if (panic_on_unrecovered_nmi) |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 429 | panic("NMI: Not continuing"); |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 430 | |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 431 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | } |
| 433 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 434 | static notrace __kprobes void default_do_nmi(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
| 436 | unsigned char reason = 0; |
Alexander van Heukelum | abd3480 | 2008-07-02 18:39:01 +0200 | [diff] [blame] | 437 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Alexander van Heukelum | abd3480 | 2008-07-02 18:39:01 +0200 | [diff] [blame] | 439 | cpu = smp_processor_id(); |
| 440 | |
| 441 | /* Only the BSP gets external NMIs from the system. */ |
| 442 | if (!cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | reason = get_nmi_reason(); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | if (!(reason & 0xc0)) { |
Jan Beulich | 20c0d2d | 2006-03-26 01:37:01 -0800 | [diff] [blame] | 446 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 447 | == NOTIFY_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | return; |
| 449 | #ifdef CONFIG_X86_LOCAL_APIC |
| 450 | /* |
| 451 | * Ok, so this is none of the documented NMI sources, |
| 452 | * so it must be the NMI watchdog. |
| 453 | */ |
Don Zickus | 3adbbcc | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 454 | if (nmi_watchdog_tick(regs, reason)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | return; |
Alexander van Heukelum | abd3480 | 2008-07-02 18:39:01 +0200 | [diff] [blame] | 456 | if (!do_nmi_callback(regs, cpu)) |
Don Zickus | 3adbbcc | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 457 | unknown_nmi_error(reason, regs); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 458 | #else |
| 459 | unknown_nmi_error(reason, regs); |
| 460 | #endif |
Don Zickus | 2fbe7b2 | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | return; |
| 463 | } |
Jan Beulich | 20c0d2d | 2006-03-26 01:37:01 -0800 | [diff] [blame] | 464 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | return; |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 466 | |
| 467 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | if (reason & 0x80) |
| 469 | mem_parity_error(reason, regs); |
| 470 | if (reason & 0x40) |
| 471 | io_check_error(reason, regs); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 472 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | /* |
| 474 | * Reassert NMI in case it became active meanwhile |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 475 | * as it's edge-triggered: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | */ |
| 477 | reassert_nmi(); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 478 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 481 | dotraplinkage notrace __kprobes void |
| 482 | do_nmi(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | nmi_enter(); |
| 485 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 486 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 487 | { int cpu; cpu = smp_processor_id(); ++nmi_count(cpu); } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 488 | #else |
| 489 | add_pda(__nmi_count, 1); |
| 490 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
Andi Kleen | 8f4e956 | 2007-07-22 11:12:32 +0200 | [diff] [blame] | 492 | if (!ignore_nmis) |
| 493 | default_do_nmi(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | nmi_exit(); |
| 496 | } |
| 497 | |
Andi Kleen | 8f4e956 | 2007-07-22 11:12:32 +0200 | [diff] [blame] | 498 | void stop_nmi(void) |
| 499 | { |
| 500 | acpi_nmi_disable(); |
| 501 | ignore_nmis++; |
| 502 | } |
| 503 | |
| 504 | void restart_nmi(void) |
| 505 | { |
| 506 | ignore_nmis--; |
| 507 | acpi_nmi_enable(); |
| 508 | } |
| 509 | |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 510 | /* May run on IST stack. */ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 511 | dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | { |
Alexander van Heukelum | b94da1e | 2008-09-09 21:55:58 +0200 | [diff] [blame] | 513 | #ifdef CONFIG_KPROBES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) |
| 515 | == NOTIFY_STOP) |
Stas Sergeev | 48c88211 | 2005-05-01 08:58:49 -0700 | [diff] [blame] | 516 | return; |
Alexander van Heukelum | b94da1e | 2008-09-09 21:55:58 +0200 | [diff] [blame] | 517 | #else |
| 518 | if (notify_die(DIE_TRAP, "int3", regs, error_code, 3, SIGTRAP) |
| 519 | == NOTIFY_STOP) |
| 520 | return; |
| 521 | #endif |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 522 | |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 523 | preempt_conditional_sti(regs); |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 524 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 525 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 528 | #ifdef CONFIG_X86_64 |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame^] | 529 | /* |
| 530 | * Help handler running on IST stack to switch back to user stack |
| 531 | * for scheduling or signal handling. The actual stack switch is done in |
| 532 | * entry.S |
| 533 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 534 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
| 535 | { |
| 536 | struct pt_regs *regs = eregs; |
| 537 | /* Did already sync */ |
| 538 | if (eregs == (struct pt_regs *)eregs->sp) |
| 539 | ; |
| 540 | /* Exception from user space */ |
| 541 | else if (user_mode(eregs)) |
| 542 | regs = task_pt_regs(current); |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame^] | 543 | /* |
| 544 | * Exception from kernel and interrupts are enabled. Move to |
| 545 | * kernel process stack. |
| 546 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 547 | else if (eregs->flags & X86_EFLAGS_IF) |
| 548 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); |
| 549 | if (eregs != regs) |
| 550 | *regs = *eregs; |
| 551 | return regs; |
| 552 | } |
| 553 | #endif |
| 554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | /* |
| 556 | * Our handling of the processor debug registers is non-trivial. |
| 557 | * We do not clear them on entry and exit from the kernel. Therefore |
| 558 | * it is possible to get a watchpoint trap here from inside the kernel. |
| 559 | * However, the code in ./ptrace.c has ensured that the user can |
| 560 | * only set watchpoints on userspace addresses. Therefore the in-kernel |
| 561 | * watchpoint trap can only occur in code which is reading/writing |
| 562 | * from user space. Such code must not hold kernel locks (since it |
| 563 | * can equally take a page fault), therefore it is safe to call |
| 564 | * force_sig_info even though that claims and releases locks. |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 565 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | * Code in ./signal.c ensures that the debug control register |
| 567 | * is restored before we deliver any signal, and therefore that |
| 568 | * user code runs with the correct debug control register even though |
| 569 | * we clear it here. |
| 570 | * |
| 571 | * Being careful here means that we don't have to be as careful in a |
| 572 | * lot of more complicated places (task switching can be a bit lazy |
| 573 | * about restoring all the debug state, and ptrace doesn't have to |
| 574 | * find every occurrence of the TF bit that could be saved away even |
| 575 | * by user code) |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 576 | * |
| 577 | * May run on IST stack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | */ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 579 | dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | struct task_struct *tsk = current; |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 582 | unsigned long condition; |
Srinivasa Ds | da654b7 | 2008-09-23 15:23:52 +0530 | [diff] [blame] | 583 | int si_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
Vincent Hanquez | 1cc6f12 | 2005-06-23 00:08:43 -0700 | [diff] [blame] | 585 | get_debugreg(condition, 6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Roland McGrath | 10faa81 | 2008-01-30 13:30:54 +0100 | [diff] [blame] | 587 | /* |
| 588 | * The processor cleared BTF, so don't mark that we need it set. |
| 589 | */ |
| 590 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); |
| 591 | tsk->thread.debugctlmsr = 0; |
| 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 594 | SIGTRAP) == NOTIFY_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | return; |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | /* It's safe to allow irq's after DR6 has been saved */ |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 598 | preempt_conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | /* Mask out spurious debug traps due to lazy DR7 setting */ |
| 601 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { |
Roland McGrath | 0f53409 | 2008-01-30 13:30:59 +0100 | [diff] [blame] | 602 | if (!tsk->thread.debugreg7) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | goto clear_dr7; |
| 604 | } |
| 605 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 606 | #ifdef CONFIG_X86_32 |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 607 | if (regs->flags & X86_VM_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | goto debug_vm86; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 609 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | /* Save debug status register where ptrace can see it */ |
Roland McGrath | 0f53409 | 2008-01-30 13:30:59 +0100 | [diff] [blame] | 612 | tsk->thread.debugreg6 = condition; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
| 614 | /* |
| 615 | * Single-stepping through TF: make sure we ignore any events in |
| 616 | * kernel space (but re-enable TF when returning to user mode). |
| 617 | */ |
| 618 | if (condition & DR_STEP) { |
Vincent Hanquez | 717b594 | 2005-06-23 00:08:45 -0700 | [diff] [blame] | 619 | if (!user_mode(regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | goto clear_TF_reenable; |
| 621 | } |
| 622 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 623 | si_code = get_si_code(condition); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | /* Ok, finally something we can handle */ |
Srinivasa Ds | da654b7 | 2008-09-23 15:23:52 +0530 | [diff] [blame] | 625 | send_sigtrap(tsk, regs, error_code, si_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 627 | /* |
| 628 | * Disable additional traps. They'll be re-enabled when |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | * the signal is delivered. |
| 630 | */ |
| 631 | clear_dr7: |
Vincent Hanquez | 1cc6f12 | 2005-06-23 00:08:43 -0700 | [diff] [blame] | 632 | set_debugreg(0, 7); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 633 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | return; |
| 635 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 636 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | debug_vm86: |
| 638 | handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, 1); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 639 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | return; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 641 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | clear_TF_reenable: |
| 644 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); |
Ingo Molnar | 6093015 | 2008-03-30 11:45:23 +0200 | [diff] [blame] | 645 | regs->flags &= ~X86_EFLAGS_TF; |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 646 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | return; |
| 648 | } |
| 649 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 650 | #ifdef CONFIG_X86_64 |
| 651 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
| 652 | { |
| 653 | if (fixup_exception(regs)) |
| 654 | return 1; |
| 655 | |
| 656 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
| 657 | /* Illegal floating point operation in the kernel */ |
| 658 | current->thread.trap_no = trapnr; |
| 659 | die(str, regs, 0); |
| 660 | return 0; |
| 661 | } |
| 662 | #endif |
| 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | /* |
| 665 | * Note that we play around with the 'TS' bit in an attempt to get |
| 666 | * the correct behaviour even in the presence of the asynchronous |
| 667 | * IRQ13 behaviour |
| 668 | */ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 669 | void math_error(void __user *ip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 671 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | siginfo_t info; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 673 | unsigned short cwd, swd, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
| 675 | /* |
| 676 | * Save the info for the exception handler and clear the error. |
| 677 | */ |
| 678 | task = current; |
| 679 | save_init_fpu(task); |
| 680 | task->thread.trap_no = 16; |
| 681 | task->thread.error_code = 0; |
| 682 | info.si_signo = SIGFPE; |
| 683 | info.si_errno = 0; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 684 | info.si_addr = ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | /* |
| 686 | * (~cwd & swd) will mask out exceptions that are not set to unmasked |
| 687 | * status. 0x3f is the exception bits in these regs, 0x200 is the |
| 688 | * C1 reg you need in case of a stack fault, 0x040 is the stack |
| 689 | * fault bit. We should only be taking one exception at a time, |
| 690 | * so if this combination doesn't produce any single exception, |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 691 | * then we have a bad program that isn't synchronizing its FPU usage |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | * and it will suffer the consequences since we won't be able to |
| 693 | * fully reproduce the context of the exception |
| 694 | */ |
| 695 | cwd = get_fpu_cwd(task); |
| 696 | swd = get_fpu_swd(task); |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 697 | |
H. Peter Anvin | a73ad33 | 2008-12-25 10:39:01 -0800 | [diff] [blame] | 698 | err = swd & ~cwd; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 699 | |
| 700 | if (err & 0x001) { /* Invalid op */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 701 | /* |
| 702 | * swd & 0x240 == 0x040: Stack Underflow |
| 703 | * swd & 0x240 == 0x240: Stack Overflow |
| 704 | * User must clear the SF bit (0x40) if set |
| 705 | */ |
| 706 | info.si_code = FPE_FLTINV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 707 | } else if (err & 0x004) { /* Divide by Zero */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 708 | info.si_code = FPE_FLTDIV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 709 | } else if (err & 0x008) { /* Overflow */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 710 | info.si_code = FPE_FLTOVF; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 711 | } else if (err & 0x012) { /* Denormal, Underflow */ |
| 712 | info.si_code = FPE_FLTUND; |
| 713 | } else if (err & 0x020) { /* Precision */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 714 | info.si_code = FPE_FLTRES; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 715 | } else { |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame^] | 716 | /* |
| 717 | * If we're using IRQ 13, or supposedly even some trap 16 |
| 718 | * implementations, it's possible we get a spurious trap... |
| 719 | */ |
H. Peter Anvin | a73ad33 | 2008-12-25 10:39:01 -0800 | [diff] [blame] | 720 | return; /* Spurious trap, no error */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | } |
| 722 | force_sig_info(SIGFPE, &info, task); |
| 723 | } |
| 724 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 725 | dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | { |
Alexander van Heukelum | 252d28f | 2008-09-09 21:56:09 +0200 | [diff] [blame] | 727 | conditional_sti(regs); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 728 | |
| 729 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | ignore_fpu_irq = 1; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 731 | #else |
| 732 | if (!user_mode(regs) && |
| 733 | kernel_math_error(regs, "kernel x87 math error", 16)) |
| 734 | return; |
| 735 | #endif |
| 736 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 737 | math_error((void __user *)regs->ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
| 739 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 740 | static void simd_math_error(void __user *ip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 742 | struct task_struct *task; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 743 | siginfo_t info; |
Alexander van Heukelum | 7b4fd4b | 2008-07-02 01:33:14 +0200 | [diff] [blame] | 744 | unsigned short mxcsr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | /* |
| 747 | * Save the info for the exception handler and clear the error. |
| 748 | */ |
| 749 | task = current; |
| 750 | save_init_fpu(task); |
| 751 | task->thread.trap_no = 19; |
| 752 | task->thread.error_code = 0; |
| 753 | info.si_signo = SIGFPE; |
| 754 | info.si_errno = 0; |
| 755 | info.si_code = __SI_FAULT; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 756 | info.si_addr = ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | /* |
| 758 | * The SIMD FPU exceptions are handled a little differently, as there |
| 759 | * is only a single status/control register. Thus, to determine which |
| 760 | * unmasked exception was caught we must mask the exception mask bits |
| 761 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. |
| 762 | */ |
| 763 | mxcsr = get_fpu_mxcsr(task); |
| 764 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 765 | case 0x000: |
| 766 | default: |
| 767 | break; |
| 768 | case 0x001: /* Invalid Op */ |
| 769 | info.si_code = FPE_FLTINV; |
| 770 | break; |
| 771 | case 0x002: /* Denormalize */ |
| 772 | case 0x010: /* Underflow */ |
| 773 | info.si_code = FPE_FLTUND; |
| 774 | break; |
| 775 | case 0x004: /* Zero Divide */ |
| 776 | info.si_code = FPE_FLTDIV; |
| 777 | break; |
| 778 | case 0x008: /* Overflow */ |
| 779 | info.si_code = FPE_FLTOVF; |
| 780 | break; |
| 781 | case 0x020: /* Precision */ |
| 782 | info.si_code = FPE_FLTRES; |
| 783 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | } |
| 785 | force_sig_info(SIGFPE, &info, task); |
| 786 | } |
| 787 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 788 | dotraplinkage void |
| 789 | do_simd_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
Alexander van Heukelum | b939bde | 2008-09-09 21:56:12 +0200 | [diff] [blame] | 791 | conditional_sti(regs); |
| 792 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 793 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | if (cpu_has_xmm) { |
| 795 | /* Handle SIMD FPU exceptions on PIII+ processors. */ |
| 796 | ignore_fpu_irq = 1; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 797 | simd_math_error((void __user *)regs->ip); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 798 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 800 | /* |
| 801 | * Handle strange cache flush from user space exception |
| 802 | * in all other cases. This is undocumented behaviour. |
| 803 | */ |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 804 | if (regs->flags & X86_VM_MASK) { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 805 | handle_vm86_fault((struct kernel_vm86_regs *)regs, error_code); |
| 806 | return; |
| 807 | } |
| 808 | current->thread.trap_no = 19; |
| 809 | current->thread.error_code = error_code; |
| 810 | die_if_kernel("cache flush denied", regs, error_code); |
| 811 | force_sig(SIGSEGV, current); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 812 | #else |
| 813 | if (!user_mode(regs) && |
| 814 | kernel_math_error(regs, "kernel simd math error", 19)) |
| 815 | return; |
| 816 | simd_math_error((void __user *)regs->ip); |
| 817 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | } |
| 819 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 820 | dotraplinkage void |
| 821 | do_spurious_interrupt_bug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | { |
Alexander van Heukelum | cf81978 | 2008-09-09 21:56:08 +0200 | [diff] [blame] | 823 | conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | #if 0 |
| 825 | /* No need to warn about this any longer. */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 826 | printk(KERN_INFO "Ignoring P6 Local APIC Spurious Interrupt Bug...\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | #endif |
| 828 | } |
| 829 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 830 | #ifdef CONFIG_X86_32 |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 831 | unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | { |
Glauber Costa | 736f12b | 2008-05-27 20:14:51 -0700 | [diff] [blame] | 833 | struct desc_struct *gdt = get_cpu_gdt_table(smp_processor_id()); |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 834 | unsigned long base = (kesp - uesp) & -THREAD_SIZE; |
| 835 | unsigned long new_kesp = kesp - base; |
| 836 | unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT; |
| 837 | __u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS]; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 838 | |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 839 | /* Set up base for espfix segment */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 840 | desc &= 0x00f0ff0000000000ULL; |
| 841 | desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) | |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 842 | ((((__u64)base) << 32) & 0xff00000000000000ULL) | |
| 843 | ((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) | |
| 844 | (lim_pages & 0xffff); |
| 845 | *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 846 | |
Stas Sergeev | be44d2a | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 847 | return new_kesp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 849 | #else |
| 850 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) |
| 851 | { |
| 852 | } |
| 853 | |
| 854 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) |
| 855 | { |
| 856 | } |
| 857 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
| 859 | /* |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 860 | * 'math_state_restore()' saves the current math information in the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | * old math state array, and gets the new ones from the current task |
| 862 | * |
| 863 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. |
| 864 | * Don't touch unless you *really* know how it works. |
| 865 | * |
| 866 | * Must be called with kernel preemption disabled (in this case, |
| 867 | * local interrupts are disabled at the call-site in entry.S). |
| 868 | */ |
Chuck Ebbert | acc2076 | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 869 | asmlinkage void math_state_restore(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | { |
| 871 | struct thread_info *thread = current_thread_info(); |
| 872 | struct task_struct *tsk = thread->task; |
| 873 | |
Suresh Siddha | aa283f4 | 2008-03-10 15:28:05 -0700 | [diff] [blame] | 874 | if (!tsk_used_math(tsk)) { |
| 875 | local_irq_enable(); |
| 876 | /* |
| 877 | * does a slab alloc which can sleep |
| 878 | */ |
| 879 | if (init_fpu(tsk)) { |
| 880 | /* |
| 881 | * ran out of memory! |
| 882 | */ |
| 883 | do_group_exit(SIGKILL); |
| 884 | return; |
| 885 | } |
| 886 | local_irq_disable(); |
| 887 | } |
| 888 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 889 | clts(); /* Allow maths ops (or we recurse) */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 890 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | restore_fpu(tsk); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 892 | #else |
| 893 | /* |
| 894 | * Paranoid restore. send a SIGSEGV if we fail to restore the state. |
| 895 | */ |
| 896 | if (unlikely(restore_fpu_checking(tsk))) { |
| 897 | stts(); |
| 898 | force_sig(SIGSEGV, tsk); |
| 899 | return; |
| 900 | } |
| 901 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */ |
Chuck Ebbert | acc2076 | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 903 | tsk->fpu_counter++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | } |
Rusty Russell | 5992b6d | 2007-07-19 01:49:21 -0700 | [diff] [blame] | 905 | EXPORT_SYMBOL_GPL(math_state_restore); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
| 907 | #ifndef CONFIG_MATH_EMULATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | asmlinkage void math_emulate(long arg) |
| 909 | { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 910 | printk(KERN_EMERG |
| 911 | "math-emulation not enabled and no coprocessor found.\n"); |
| 912 | printk(KERN_EMERG "killing %s.\n", current->comm); |
| 913 | force_sig(SIGFPE, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | schedule(); |
| 915 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | #endif /* CONFIG_MATH_EMULATION */ |
| 917 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 918 | dotraplinkage void __kprobes |
| 919 | do_device_not_available(struct pt_regs *regs, long error) |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 920 | { |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 921 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 922 | if (read_cr0() & X86_CR0_EM) { |
| 923 | conditional_sti(regs); |
| 924 | math_emulate(0); |
| 925 | } else { |
| 926 | math_state_restore(); /* interrupts still off */ |
| 927 | conditional_sti(regs); |
| 928 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 929 | #else |
| 930 | math_state_restore(); |
| 931 | #endif |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 932 | } |
| 933 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 934 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 935 | dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code) |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 936 | { |
| 937 | siginfo_t info; |
| 938 | local_irq_enable(); |
| 939 | |
| 940 | info.si_signo = SIGILL; |
| 941 | info.si_errno = 0; |
| 942 | info.si_code = ILL_BADSTK; |
| 943 | info.si_addr = 0; |
| 944 | if (notify_die(DIE_TRAP, "iret exception", |
| 945 | regs, error_code, 32, SIGILL) == NOTIFY_STOP) |
| 946 | return; |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 947 | do_trap(32, SIGILL, "iret exception", regs, error_code, &info); |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 948 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 949 | #endif |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 950 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | void __init trap_init(void) |
| 952 | { |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 953 | #ifdef CONFIG_X86_32 |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 954 | int i; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 955 | #endif |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | #ifdef CONFIG_EISA |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 958 | void __iomem *p = early_ioremap(0x0FFFD9, 4); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 959 | |
| 960 | if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | EISA_bus = 1; |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 962 | early_iounmap(p, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | #endif |
| 964 | |
Alexander van Heukelum | 976382d | 2008-09-09 21:55:57 +0200 | [diff] [blame] | 965 | set_intr_gate(0, ÷_error); |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 966 | set_intr_gate_ist(1, &debug, DEBUG_STACK); |
| 967 | set_intr_gate_ist(2, &nmi, NMI_STACK); |
| 968 | /* int3 can be called from all */ |
| 969 | set_system_intr_gate_ist(3, &int3, DEBUG_STACK); |
| 970 | /* int4 can be called from all */ |
| 971 | set_system_intr_gate(4, &overflow); |
Alexander van Heukelum | 64f644c | 2008-09-09 21:56:00 +0200 | [diff] [blame] | 972 | set_intr_gate(5, &bounds); |
Alexander van Heukelum | 12394cf | 2008-09-09 21:56:01 +0200 | [diff] [blame] | 973 | set_intr_gate(6, &invalid_op); |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 974 | set_intr_gate(7, &device_not_available); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 975 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 976 | set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 977 | #else |
| 978 | set_intr_gate_ist(8, &double_fault, DOUBLEFAULT_STACK); |
| 979 | #endif |
Alexander van Heukelum | 51bc1ed | 2008-09-09 21:56:03 +0200 | [diff] [blame] | 980 | set_intr_gate(9, &coprocessor_segment_overrun); |
Alexander van Heukelum | 6bf77bf | 2008-09-09 21:56:04 +0200 | [diff] [blame] | 981 | set_intr_gate(10, &invalid_TSS); |
Alexander van Heukelum | 36d936c | 2008-09-09 21:56:05 +0200 | [diff] [blame] | 982 | set_intr_gate(11, &segment_not_present); |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 983 | set_intr_gate_ist(12, &stack_segment, STACKFAULT_STACK); |
Alexander van Heukelum | c6df0d7 | 2008-09-09 21:56:07 +0200 | [diff] [blame] | 984 | set_intr_gate(13, &general_protection); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 985 | set_intr_gate(14, &page_fault); |
Alexander van Heukelum | cf81978 | 2008-09-09 21:56:08 +0200 | [diff] [blame] | 986 | set_intr_gate(15, &spurious_interrupt_bug); |
Alexander van Heukelum | 252d28f | 2008-09-09 21:56:09 +0200 | [diff] [blame] | 987 | set_intr_gate(16, &coprocessor_error); |
Alexander van Heukelum | 5feedfd | 2008-09-09 21:56:10 +0200 | [diff] [blame] | 988 | set_intr_gate(17, &alignment_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | #ifdef CONFIG_X86_MCE |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 990 | set_intr_gate_ist(18, &machine_check, MCE_STACK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | #endif |
Alexander van Heukelum | b939bde | 2008-09-09 21:56:12 +0200 | [diff] [blame] | 992 | set_intr_gate(19, &simd_coprocessor_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 994 | #ifdef CONFIG_IA32_EMULATION |
| 995 | set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall); |
| 996 | #endif |
| 997 | |
| 998 | #ifdef CONFIG_X86_32 |
Jan Beulich | d43c6e8 | 2006-01-06 00:11:49 -0800 | [diff] [blame] | 999 | if (cpu_has_fxsr) { |
Jan Beulich | d43c6e8 | 2006-01-06 00:11:49 -0800 | [diff] [blame] | 1000 | printk(KERN_INFO "Enabling fast FPU save and restore... "); |
| 1001 | set_in_cr4(X86_CR4_OSFXSR); |
| 1002 | printk("done.\n"); |
| 1003 | } |
| 1004 | if (cpu_has_xmm) { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 1005 | printk(KERN_INFO |
| 1006 | "Enabling unmasked SIMD FPU exception support... "); |
Jan Beulich | d43c6e8 | 2006-01-06 00:11:49 -0800 | [diff] [blame] | 1007 | set_in_cr4(X86_CR4_OSXMMEXCPT); |
| 1008 | printk("done.\n"); |
| 1009 | } |
| 1010 | |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 1011 | set_system_trap_gate(SYSCALL_VECTOR, &system_call); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 1013 | /* Reserve all the builtin and the syscall vector: */ |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 1014 | for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++) |
| 1015 | set_bit(i, used_vectors); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 1016 | |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 1017 | set_bit(SYSCALL_VECTOR, used_vectors); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 1018 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | /* |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 1020 | * Should be a barrier for any external CPU state: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | */ |
| 1022 | cpu_init(); |
| 1023 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 1024 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | trap_init_hook(); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 1026 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | } |